Jantzen Wax Coil or Mundorf M-Coil CFC

My USB and XLR cables are DIY copper foil. 

Speaker cables are 12 gauge Neotech Solid OCC Copper DIY

Internal cables, including crossover are 14 Gauge Neotech Solid OCC copper

Once you build your crossover, just try out a few different ones, see what sounds best in your application. Every speaker is different. 

Must be a tad tricky soldering foil type conductors to those mini usb solder tabs! 

@grannyring My dac doesn’t use the Power and Ground connectors.

It was hard at first, but I have gotten very good at it :) The trick is in the fold at the very ends.   

I use 16 gauge Mundorf foil for my cables. 17mm wide.

And yes, they sound incredible.

Are Jantzen Wax Coil inductors the best solution for mid-bass crossover?

How do they compared to Solen Hepta Litz Inductors?

How do they compared to vintage iron core inductors?

Better in every way. 

Iron cores should never be used in any speakers you care to keep around.

The foils are better than the litz in resolution, dynamics, speed, clarity, timbre to name just a few things.